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基本信息：1769-OF8C 緊湊型輸入/輸出模塊 用于驅(qū)動(dòng)控制回路的最終控制元件
Allen-Bradley 1769-OF8C是緊湊型輸入/輸出模塊。該模塊與1769和某些1768 CompactLogix控制器以及MicroLogix 1500控制器兼容使用。該模塊是一個(gè)模擬輸出模塊，通常用于驅(qū)動(dòng)控制回路的最終控制元件(FCE)以及向接收和測(cè)量元件發(fā)送信號(hào)。
1769-OF8C主要具有八(8)個(gè)單端電流輸出通道，可配置為0-20 mA和4-20 mA。它內(nèi)置16位數(shù)模轉(zhuǎn)換器(DAC ),分辨率分別為15.59位、0.323 A/位(適用于4-20 mA電流)和15.91位、0.323 A/位(適用于0-20 mA電流)。所有通道的轉(zhuǎn)換速率均為5ms，63%輸出的階躍響應(yīng)小于2.9 ms，模擬輸出范圍為0-21 mA和3.2-21 mA。
可由1769-OF8C驅(qū)動(dòng)的典型最終控制元件(FCE)是調(diào)制控制閥、變頻驅(qū)動(dòng)器(VFD)、定位器和其他設(shè)備。為了在自動(dòng)控制回路中使用，該模塊可以集成到嵌入在處理器內(nèi)的比例+積分+微分(PID)控制器中。可以從該設(shè)備接收信號(hào)的兼容接收和測(cè)量元件是面板儀表、數(shù)據(jù)記錄器、信號(hào)分離器和其他類似類型的設(shè)備。
1769-OF8C是一個(gè)單寬模塊，可作為本地I/O和擴(kuò)展I/O機(jī)架的一部分安裝在1769和1768 CompactLogix組件上。它也可以與MicroLogix 1500控制器一起使用。
Allen-Bradley 1769-OF8C可支持多達(dá)8個(gè)通道的同步模擬電流輸出。在模塊的正面，有一個(gè)LED指示燈，當(dāng)模塊沒(méi)有遇到問(wèn)題時(shí)，該指示燈會(huì)亮起綠色。如果檢測(cè)到開(kāi)環(huán)情況，該狀態(tài)LED燈可以警告用戶。該模塊還具有過(guò)流和過(guò)壓保護(hù)功能。1769-OF8C緊湊型Logix系列電流輸出模塊需要24伏DC額定外部電源，它包括通道到地面的隔離。所有輸出都具有16位分辨率。1769-OF8C輸出模塊包括一個(gè)集成的可拆卸接線盒，對(duì)連接到執(zhí)行機(jī)構(gòu)的接線進(jìn)行手指安全保護(hù)。該端子板位于輸出模塊前面的門(mén)后。該模塊見(jiàn)的接線方式是從模塊下方布線至輸出端子。1769-OF8C也有一個(gè)替換門(mén)套件，它使用22×14 AWG尺寸的實(shí)心銅線。1769-OF8C的輸出阻抗大于1歐姆，并且具有短路保護(hù)。該模塊可在0至60攝氏度的溫度范圍內(nèi)運(yùn)行。它在25攝氏度時(shí)的精度為滿量程的0.35%。1769-OF8C的重量約為0.28千克，尺寸為4.65英寸x 1.38英寸x 3.43英寸。
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1769-OF8C
The Allen-Bradley 1769-OF8C is Compact I/O module. This module is compatible for use with the 1769 and some 1768 CompactLogix controllers as well as with the MicroLogix 1500 controllers. This module is an analog output module, typically used for driving Final Control Elements (FCE) of a control loop as well as deliver signals to receiving and measuring elements.
The 1769-OF8C mainly features Eight (8) Single-ended current output channels, configurable for 0-20 mA and 4-20 mA. It features 16-bit Digital to Analog Converter (DAC), with specific resolution of 15.59 bits, 0.323 µA/bit for 4-20 mA and 15.91 bits, 0.323 µA/bit for 0-20 mA. It has a conversion rate of 5ms on all channels and step response to 63% output of less than 2.9 ms. The analog output range is 0-21 mA and 3.2-21 mA.
Typical Final Control Elements (FCE) that can be driven by the 1769-OF8C are Modulating Control Valves, Variable Frequency Drives (VFD), Positioners and other devices. To be used in automatic control loop, this module may be integrated to a Proportional + Integral + Derivative (PID) controller that is embedded within the processor. Compatible receiving and measuring elements that can receive signal from this device are panel meters, data loggers, signal splitters and other similar type of devices.
The 1769-OF8C is a single width module, that can be installed along the 1769 and 1768 CompactLogix assembly as local I/O and part of the expansion I/O rack. It may also be used with MicroLogix 1500 controller.
The Allen-Bradley 1769-OF8C can support up to 8 channels of simultaneous analog current output. On the front side of the module, there is one LED indicator that energizes Green when the module is not experiencing problems. This status LED light can warn the users if it detects an open-loop condition. The module also has overcurrent and overvoltage protection features. The 1769-OF8C Compact Logix series current output module requires a 24 Volts DC rated external power supply and it includes channel-to-earth ground isolation. All of the outputs have a 16-bit resolution. The 1769-OF8C output module includes an integral removable terminal block with finger-safe protection for the wiring to the actuators. This terminal block can be found behind a door at the front of the output module. The most common way of wiring this module is by routing it from beneath the module to the output terminals. The 1769-OF8C also has a replacement door kit and it uses a solid copper wire with a 22 by 14 AWG size. The output impedance for the 1769-OF8C is more than 1 Ohm and it is protected from short-circuiting. The module is built to operate at a temperature range of 0 to 60 degrees Celsius. Its accuracy at 25 degrees Celsius is ?±0.35% of the full scale. The 1769-OF8C is shipped with an approximate weight of 0.28 kilograms, and it measures 4.65 inches x 1.38 inches x 3.43 inches.
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